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 Magnetism 38 Flashcards |
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What is the primary mineral that makes up lodestone? |
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Iron oxide (Fe₃O₄) |
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Which type of magnet is created when a magnetic material is placed near a magnet and gains magnetic properties? |
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Induced magnet |
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True or False: Like poles of magnets attract each other. |
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False. Like poles repel each other. |
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Riddle: I can be strong or weak, but I only exist when current flows. What am I? |
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Electromagnet |
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The space around a magnet where the magnetic force is exerted is called ______. |
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Magnetic field |
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Which type of magnet retains its magnetism permanently? |
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Permanent magnet |
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What happens to the magnetic field lines inside a magnet? |
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They run from south to north. |
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Fill in the blank: The ______ is the point where the net magnetic field is zero. |
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Neutral point |
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What determines the direction of a magnetic field line? |
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The tangent at any point on the line indicates the magnetic field direction. |
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Riddle: I am a material that can be magnetized easily and lose magnetism quickly when current stops. What am I? |
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Soft iron |
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True or False: The Earth's magnetic poles are aligned exactly with its geographic poles. |
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False. The magnetic poles are tilted from the geographic poles. |
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What is the primary use of an electromagnet in industrial applications? |
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Lifting heavy iron scrap. |
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Fill in the blank: The magnetic field of Earth is directed from geographic ______ to ______. |
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South to North |
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What effect does increasing the current in a solenoid have on the magnetic field? |
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It increases the strength of the magnetic field. |
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Which component in an electric bell is responsible for ringing the bell? |
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Hammer |
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What type of magnetic field is produced when a bar magnet's north pole faces north? |
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Non-uniform magnetic field |
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MCQ: Which of the following describes the property of a permanent magnet? A) Temporary field B) Easily demagnetized C) Field strength can be changed D) Retains magnetism |
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D) Retains magnetism |
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Fill in the blank: A magnet's north pole will attract a ______ pole of another magnet. |
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South |
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What is the primary difference between an electromagnet and a permanent magnet? |
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Electromagnets are temporary and depend on current flow, while permanent magnets retain their magnetism. |
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Completed! Keep practicing to master all of them. |
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